What AFT Index range indicates that an aircraft is "Tail Heavy"?

The AFT Index range that indicates an aircraft is "Tail Heavy" is indeed defined as being between 86 to 99. This classification is crucial in aviation because a tail-heavy condition can significantly affect an aircraft's handling and stability. When an aircraft falls within this AFT Index range, it typically implies that the center of gravity is located too far toward the rear of the aircraft, potentially leading to issues such as difficulty in controlling pitch and increased risk during takeoff and landing.

In contrast, other ranges would indicate either a balanced load or a nose-heavy condition, which can also have their own sets of operational implications. Understanding these distinctions is vital for pilots and ground crew when ensuring that an aircraft is within safe operating parameters before flight. Recognizing the significance of the AFT Index helps maintain safety and efficiency in aircraft operations.